System of electrical distribution.



E. EVANS.

SYSTEM OF ELECTRICAL DISTRIBUTION.

APPLICATION FILED NOV. 12. 1912.

1,158,037. Patented 0ct.26,1915.

Witnesses: Invent or":

M q var-1 Evans,

b 1 y is fittor'n g UNITED STATES PATENT oEEioE.

EVAN EVANS, OF BERLIN, GERMANY, ASSI G-NOR TO GENERAL ELECTRIC COMPANY, A

. CORPORATION OF NEW YORK.

SYSTEM OF ELECTRICAL DISTRIBUTION.

To all whom it may concern:

Be it known that I, EVAN EVANS, a subject of the Emperor of Germany, residing any current limiting device.

A current limiting device which will differentiate between current supplied to different sets of translating devices, such as lighting devices and power devices, particularly where the power current is much greater than the lighting current, is very desirable, and the objeot'of my present invention is to provide sucha device for use in a system of electrical distribution.

My invention will be best understood from a consideration of the accompanying drawing in which the figure illustrates diagrammatically one form of apparatus for carrying out invention. In this figure there is shown a system of electrical distribution comprising conductors A supplying current, from any suitable source, to different sets of translating devices B and C. The devices B as shown in the figure consist of electric lights while the devices C are composed of power installations, such as motors, heaters, and the like. Although I have shown only two sets of translating devices, it is obvious that the system may contain more than two sets. A current limiting device 1 is interposed in this system and comprises a current responsive device such as an electromagnet or relay 2 having a pivoted arma .ture 3. The coil of the electromagnet 2 is connected between terminals 4: and 5 which terminals are connected to one of the conductors A and-to the translating devices 0 respectively. A third terminal 6 of the current limiting device is normally connected through the armature 3 and a fixed contact 7 to that end of the coil or relay 2 Specification of Letters Patent.

Patented Oct. 26, 1915.

Application filed November 12, 1912. Serial No. 730,872.

which is connected to terminal 5. .The terminal 6 is connected to the translating devices B. I i

In the operation of this device the electromagnet 2 is designed or adjusted so that it will attract its armature when a prededinarily be considerable greater than the limited amount of current which is allowed.

the consumer for lighting purposes, and under such circumstances when the translating devices C are consuming current, the

relay 2 is sufficiently energized to raise the armature 3 and open the circuit of the lighting devices B. No current can, therefore, be taken for lighting purposes when the current being consumed for power purposes exceeds a predetermined amount. If the consumer desires to use current for lighting purposes, he must cut out of service the power translating devices C, or so restrict his consumption of current in the devices C that the total consumption of current in the devices C and B does not exceed the maximum quantity of current allowed for lighting purposes. By this'current. limiting device the amount of current which can be supplied to one circuit is limited, while that which can be supplied to another circuit is unlimited. When the consumer desires to use his lighting devices he must restrict his total consumption of current so that the relay 2 is not sufliciently energized to attract the armature 3 and thus prevent the flow of current in the circuit of the lighting devices. The consumer will ordinarily desire to use his lighting devices in the evenning hours when the central station is most heavily loaded, and my improved form of current limiting device will restrict the consumption of current during the peak load and thus improve the load curve of the station.

The current limiting device of my invention not only limits the quantity of energy which may be taken for lighting purposes, but prevents entirely the fiow of current in the lighting circuit when the current flowing in the power circuit alone or the total current flowing in both circuits exceeds a predetermined quantity.

Although I have illustrated the principle of my invention in connection with lighting circuits and power circuits, it is obvious that my invention is not limited to such classes of circuits. My invention is applicable wherever it is desired to restrict or limit the quantity of energy supplied to one of a plurality of sets of translating devices.

In accordance with the provisions of the patent statutes I have described the principle of operation of my invention together of current flowing in all of said sets of translating devices for limiting the total quan' tity of current which can be jointly taken by said translating devices during the times that current flows in one particular set of translating devices. I

2. A system of electrical distribution comprising a source of electric current, two sets of translating devices, and a current limiting device, responsive to the combined flow of current in both sets of translating devices and adapted to interrupt the flow of current in one set of translating devices whenever the combined demand of both sets of translating devices upon said source exceeds a predetermined value.

3. A system of electrical distribution comprising a source of electric current, a plutranslating devices, and means cooperating with said current responsive device for interrupting the flow of current in one set of translating devices when the combined demand of all of said sets of translating devices exceeds a predetermined value.

A system of electrical distribution comprising a source of electric current, a light ing circuit and a power circuit, and means responsive to the combined current flowing in both of said circuits for limiting the total quantity of current which can be jointly taken by both circuits during the times that current flows in the lighting circuit.

5. A system of electrical distribution, comprising a source of electric current, a lighting circuit and a power circuit, and a device interposed in said system and responsive to the current flowing in both circuits for limiting the amount of current which can be supplied to the lighting circuit.

6. A system of electrical distribution comprising a source of electric current, a lighting circuit and a power circuit, a current responsive device in series with both of said circuits, and means cooperating with said current responsive device for preventing the How of current in said lighting circuit when the combined demand of both circuits is in excess of a predetermined amount.

In witness whereof, I have hereunto set my hand this 29th day of October, 1912.

EVAN EVANS.

\Vitnesses \VOLDEMAR HAUr'r, HENRY I-Lxsrun.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

